1. The problem statement, all variables and given/known data M1 is on a frictionless flat horizontal surface. It is attached to M2 by a string, which hangs freely from the string which passes over a frictionless pulley of negligible mass. Find a general expression for the acceleration of both M1 and M2. Look at your result and argue that it should be correct. 2. Relevant equations 3. The attempt at a solution I'm not really sure how to word this but: If the mass of M2 is...say .050kg , the force acting on M2 would be the mass of it * gravity. In order to accelerate, M1 would need to have a force act on it that is greater than the mass of M2. If the force pushing M1 was = to the mass of M2 , then M1 would be static. Is this correct?